Molecular control of a GaAs transistor

K. Gartsman, D. Cahen, A. Kadyshevitch, J. Libman, T. Moav, R. Naaman, A. Shanzer, V. Umansky, A. Vilan

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


The interactions between adsorbed organic molecules and the electronic charge carriers in specially made GaAs structures are studied by time- and wavelength-dependent measurements of the photocurrent. The adsorption of the molecules modifies the photocurrent decay time by orders of magnitude. The effects are molecularly specific, as they depend on the electronic properties and absorption spectrum of the molecules. These observations are rationalized by assuming that new surface states are created upon adsorption of the molecules and that the character of these states is controlled by the relative electronegativity of the substrates and the adsorbed molecules. The relevance for surface passivation and for construction of semiconductor-based sensors is indicated.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalChemical Physics Letters
Issue number5-6
StatePublished - 13 Feb 1998
Externally publishedYes


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